Forced air heater



E. H. RYDEN Er AL FoRcEn In HEATER v Filed sept. 15, 1941 July zo, `194:5.

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E. H. RYDEN ET AL FORCED AIR HEATER Filed sept. 13.- 1941 asusta-sheet 2 ATTORNEY.

mvENToRS 7e/d Pros/v fra/emmer M ,fm m1614011* Paieniediuly 2o, 1943 FORCED Am HEATER Eric H. Ryden, Bedford, and Frank R. Hixley, `Cleveland Heights, hlo assig'nors to The Bryant Heater Company, Cleveland, Ohio, a

corporation of Ohio Application September 13, 1941, Serial No. v410,746

4 Claims.

This invention relates to, improvements in forced air heaters, and has reference particularly to heaters that are designed to be hung from the ceiling of a room and to discharge heated air in a radial or downwardly radial direction. y

One o-f the objects of the invention is the provision of a heater of the type indicated which shall becompact, of low cost, and highly eiicient in operation.

Another object is the provision of a heater of `the character stated which shall be compact and pleasing 'in appearance and yet` adapted to Utilize an annular burner of .relatively large size.

A further object is the provision of means for inducing a draft for exhausting `the products of combustion in a heater of this character.

Other objects and features of novelty will appear as we proceed with the description of that embodiment of the invention which, for the Purposes of the present application, we have illustrated inthe accompanying drawings, in which Fig. l is a vertical central sectional view of a heater embodying the invention, vthe view being taken substantially on the line I-I of Fig. 2.

Fig. 2 is a plan view of the same, some of the parts being broken away in order to more clearly illustrate the invention, and

Figs. 3 and 4 are detail sectional Views, taken substantially on the lines 3-3 and 4-,4, respectively, of Fig. 2. 4

An important element of the present c onstruction is an iron casting I0 comprising an annular wall provided on its upper side with vanes I I and on its lower side with fins I2. 'The lower side of the casting and the iins I2 absorb heat from combustion gases, while the upper` side and the vanes I I transfer this heat to centrifugally moving air.

The vanes II are surmouhted by an annular plate I3 having a slight upturn at its inner edge and a downwardly curved rim shaped to conform to the curvature of the vanes II` A second and somewhat wider annular plate I4 is mounted above plate I3, being spaced from the latter plate by a plurality Vof washers I5 which surround screws I6 that extend through holes in the plates I3 and I4 and are threaded into tapped holes in certain of the varies Il. The heater isA designed to be supported from above by means of rods Il i which extend through suitable holes in the plates I3 and I4'and are threadedinto. tapped holes in certain of the vanes Il. Y

The plate I4 .may carry a soft `rubber ring I6 upon which is supported the outer edge of an annular metal plate I9, these two plates being secured together with the ring I8 interposed tween them by a series of small bolts 20. The inner edge of'plate vI3 is attached by means of bolts 2l to a `ange 22 that is integral with the housing of an electric motor 23 having a depending shaft 24 uponwhich is mounted the rotor 25 of a vcentrifugal blower which turns in the direction of arrow A, Fig. 2. Air to' be treated enters axially from below through the throat 26 of the casting I0, and is forced outwardly in directions conforming generally to the planes of the vanes l I through a diffuser comprising the upper surface of the casting I0 4and the lower surface From the lower side of the casting I0 there is suspended a combustion chamber and a hot gas "conductor, As illustrated herein the sheet metal work for these parts comprises a cylindrical element 30 to which is Welded or otherwise secured a 'series of angle brackets 3l. Screws 32 project through these brackets into tapped' holes in certain of the ns I2. An annular plate 33 with upturned inner and outer anges is suitably secured to the throat 26 of the casting I0 and to the cylindrical sheet metal element 30. From the 'of the plate I3, the venes I I being positioned subouter downturned edge of the casting II) there is supported a further cylindrical element 34, and an annular plate 36 is secured to the lower` edges `of the two elements 30 and 34. The chamber 36 I provided by the elements 30, 34 and 35 and the outer downturned wall or casting I0 is utilized as a combustion chamber, and in it isv mounted a substantially annular gas burner which receives a gas and air mixture through a goose neck 38, to the upper end of which is connected a gas valve 33, oi any desired character, a diaphragm valve being illustrated.' A valve Vof this kind is` necessarily somewhat bulky, but in this case it occupies space which would .otherwise be unoc cupied, that is space above the plate I4 necessirated by the vertical dimension of the motor 2a The chamber 40 provided within the cylindrical element 30, the plate 33 and the casting Illjconstitutes a substantially annular conductor for hot gases. These eases flow upwardly from burner 31 `through combustion chamber 35, wipe against the. wall of casting I6 vand then inwardly along the fins l2 over the top oi cylindrlcal'element 30 and into conductor 40. Avertical wall 4|,

which may be formed as an integral part of casting I0, blocks the conductor 40 andthe upper Dart of the annular combustion chamber 38 at one point. The hot gases now in the direction of the arrows B through the conductor around the casting' and out to the flue between the wall 4| and a second wall 42 which blocks oi the upper part oi the combustion chamber only. `The upper part is separated from the lower part between walls 4i and d2 by a oor member 9. The gases are discharged through a ue connection $3, Fig. 3, which embodies a tubular element or nozzle de communicating with the diffuser. Air from the blower discharged through the nozzle 4l induces suction which causes the hot gases to now through the conductor 80 and out to the iiue, this action being particularly important until the ue heats up to thereby induce a natural draft. The fins i2 which preferably are oi' the same number as the varies H and are in the same planes with 'those vanes, guide the hot gases from the combustion chamber 36 into the gas conductor il@ in approximately the directions in which the gases would ow were the vanes omitted. Hence they do not interpose any considerable amount of friction. They are omitted in the passage between the walls di and 42 so Athat there may not be any interference with the travel of the outgoing gases.

The casting i0, it will be observed, forms a common cover for the combustion chamber 36 and the gas conductor de. The hot gases from the burner at all points around the apparatus now upwardly and against the casting wall and then inwardly and downwardly into the conductor im. All of these gases after entering the conductor unite to form a stream owing in a circular path through the conductor and out to the Iiue through connection 63 as previously stated. Air to be heated ows upwardly at the center of the apparatus into the blower and out through the diffuser formed by the annular casting i and the annular plate i3. leaving the heater in more or less radial directions but with a downward tendency due yik) the downward slope of the outer portion of casting l0 assisted by the downwardly curved rims of plates I3 and It. The two slopes of the casting wall, together with the plate i3, produce a venturi eect which assists the action of the diuser.

In the foregoing description we have necessarily gone somewhat into detail in order to explain iully the particular embodiments of the invention herein illustrated, but we desire it to be understood that such detaildisclosures areA not to be construed as amounting to limitations, exccpixzngs they may be included in the appended c a lit Having .thus described our invention, we claim:

1. In a forced air heater, an annular combustion chamber, an annular conductor for hot gases concentric with and adjacent to said combustion chamber, a common cover for said combustion chamber and conductor 1caving an upper annular passage between them, said conductor having an exit for combustion gases, means on the upper side of the cover and cooperating therewith to provide an air diiuser discharging peripherally, and a centrifugal blower rotor mounted concentric with said combustion chamber and conductor to receive air axially and discharge it directly into said diffuser in contact with the upper surface of said cover. f

2. In a forced air heater, an annular coniustion chamber, an annular gas burner therein, an annular conductor for hot gases concentric ,with and adjacent to saidvcombustion chamber, said conductor and combustion chamber having a common side wall and a common cover, the cover being spaced from the top of the side wall to provide an annular passage between them, means on. .the upper side of the cover and cooperating therewith to provide an air diffuser discharging peripherally, and a centrifugal blower` rotor mounted concentric with said combustion chamber and conductor to receive air axially and discharge it directly into said diffuser in contact with the upper surface of said cover.

3. In a forced air lheater, an annular hot gas conductor, means arranged adjacent said conductor toprovide an air diffuser passage exposed on one side to a face of said conductor and dis charging peripherally, a centrifugal blower rotor .mounted concentric with said conductor to receive air axially and discharge it directly into said diiuser in contact with said conductor face, said conductor having an exit opening, and an air tube arranged concentric with said exit opening, a portion of the air discharged by said rotor passing through said tube, thereby inducing ejection of the exhaust gases.

4. In a forced air heater, a combustion chan.- ber, an annular conductor for hot gases connected with said combustion chamber, said conlductor having an exit for combustion gases,

means on the upper side of the conductor and coing peripherally, a centrifugal blower coaxial with said diiluser arranged within the latter adapted to force air over the conductor through said ditfuser, and means for causing a portion of said discharged air to have ejector eiect upon the exhaust gases passing out through said exit. ERICH. RYDEN. FRANK R. HIGLEY.

to form a diiuser discharg- 

